That is a very small leak I see, infact I have seen a bunch of toyotas leak about this much on new cars - Toyota claim that its normal as the pump seal requires a "leak" so it can lubricate itself and not burn off.

They are also a pretty good manufacturer..

Is this leak a very bad leak as in you can see the green coolant making a drip trail on the engine? Or just these crusties?

OTOH, I lived in other countries where pump rebuilds are still normal businesses - One of the shops showed me the seals of new available pumps of lower cost - which the shop said that they dont play well with old silicated coolants and work perfect with the new ones. (they used to do a lot of heavy truck stuff)

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)